AIIMS2014PhysicsWork, Power and Energy
A body of mass 2 ~kg is thrown up vertically with kinetic energy of 490 ~J . The height at which the kinetic energy of the body becomes half of its original value is
Options
- A50 ~m
- B12.25 ~m
- C25 ~m
- D10 ~m
Correct answer
B. 12.25 ~m
Step-by-step solution
Potential energy at the required height = 490 2 =245 ~J Again, 245=2 10 h or h= 245 20 ~m =12.25 ~m